(yet another) Custom templatetag raising KeyError when DEBUG=False

Hello all, this is a cross post i made on stackoverflow
http://stackoverflow.com/questions/27503581/yet-another-custom-templatetag-raising-keyerror-when-debug-false

I'm trying to use a custom templatetag (this one actually:
https://djangosnippets.org/snippets/2875/), on my project which works
fine as long as DEBUG=True. When it's False, the relevant error part
is:

File "...app/templatetags/helper_tags.py", line 15, in change_lang
path = context['request'].path
File "...local/lib/python2.7/site-packages/django/template/context.py",
line 56, in __getitem__
raise KeyError(key)
KeyError: 'request'

I've seen a lot of questions like this and I have already done the
settings that all of them seen to suggest which are:

1) views.py uses django.shortcuts.render:

from django.shortcuts import render
def home(request):
return render(request, 'home.html')

2) settings.py contains:

ALLOWED_HOSTS = ['*']

from django.conf import global_settings
TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS + (
"django.core.context_processors.request",
)

I've also created a new project with the same Django version (1.6.2)
that tries to imitate the problematic project as much as possible, and
for my despair it works fine also when DEBUG=False.

Any hints on this is very much appreciated.

Cheers!

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